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<title>Problem 2446. -- 石头剪刀布 -- 衡阳八中OJ离线版-2012-02-29</title><center><h2>2446: 石头剪刀布</h2><span class=green>Time Limit: </span>50 Sec&nbsp;&nbsp;<span class=green>Memory Limit: </span>128 MB<br><span class=green>Submit: </span>2&nbsp;&nbsp;<span class=green>Solved: </span>1<br>[<a href='submitpage.php?id=2446'>Submit</a>][<a href='problemstatus.php?id=2446'>Status</a>][<a href='bbs.php?id=2446'>Discuss</a>]</center><h2>Description</h2><div class=content><div style="text-indent: 21pt"><span style="font-size: 12pt">A</span><span style="font-size: 12pt">和</span><span style="font-size: 12pt">B</span><span style="font-size: 12pt">进行石头剪刀布的游戏。</span></div>
<div style="text-indent: 21pt">&nbsp;<span style="font-size: 12pt">游戏按照每轮进行，每轮进行</span><span style="font-size: 12pt">n</span><span style="font-size: 12pt">局，如果</span><span style="font-size: 12pt">A</span><span style="font-size: 12pt">先比</span><span style="font-size: 12pt">B</span><span style="font-size: 12pt">多获胜</span><span style="font-size: 12pt">m1</span><span style="font-size: 12pt">轮，</span><span style="font-size: 12pt">A</span><span style="font-size: 12pt">赢得游戏；如果</span><span style="font-size: 12pt">B</span><span style="font-size: 12pt">先比</span><span style="font-size: 12pt">A</span><span style="font-size: 12pt">多获胜</span><span style="font-size: 12pt">m2</span><span style="font-size: 12pt">轮，</span><span style="font-size: 12pt">B</span><span style="font-size: 12pt">赢得游戏。</span></div>
<div style="text-indent: 21pt"><span style="font-size: 12pt">对于每轮，进行</span><span style="font-size: 12pt">n</span><span style="font-size: 12pt">局游戏，已知每局</span><span style="font-size: 12pt">B</span><span style="font-size: 12pt">出石头、剪刀和布的概率，每局如果</span><span style="font-size: 12pt">A</span><span style="font-size: 12pt">赢</span><span style="font-size: 12pt">A</span><span style="font-size: 12pt">得一分，如果</span><span style="font-size: 12pt">B</span><span style="font-size: 12pt">赢</span><span style="font-size: 12pt">B</span><span style="font-size: 12pt">得一分，平局没人得分。最后得分多的人此轮获胜，得分相同此轮无人获胜。</span></div>
<div style="text-indent: 21pt"><span style="font-size: 12pt">求</span><span style="font-size: 12pt">A</span><span style="font-size: 12pt">获胜的最大概率。</span></div>
<div style="text-indent: 21pt"><span style="font-size: 12pt">多组数据。</span></div></div><h2>Input</h2><div class=content><div>&nbsp;</div>
<div style="text-indent: 21pt"><span style="font-size: 10.5pt">读入包含多组数据。</span></div>
<div style="text-indent: 21pt"><span style="font-size: 10.5pt">对于每组数据：</span></div>
<div style="text-indent: 21pt"><span style="font-size: 10.5pt">第一行包含三个数和</span><span style="font-size: 10.5pt">n</span><span style="font-size: 10.5pt">，</span><span style="font-size: 10.5pt">m1</span><span style="font-size: 10.5pt">，</span><span style="font-size: 10.5pt">m2</span><span style="font-size: 10.5pt">，如题目描述。</span></div>
<div style="text-indent: 21pt"><span style="font-size: 10.5pt">接下来</span><span style="font-size: 10.5pt">n</span><span style="font-size: 10.5pt">行，每行</span><span style="font-size: 10.5pt">3</span><span style="font-size: 10.5pt">个数，分别表示</span><span style="font-size: 10.5pt">B</span><span style="font-size: 10.5pt">每局出<b>石头、布与剪刀</b>的百分率，保证三个数的和是</span><span style="font-size: 10.5pt">100</span><span style="font-size: 10.5pt">。</span></div></div><h2>Output</h2><div class=content><div style="text-indent: 21pt">&nbsp;</div>
<p>对于每组数据输出一行，表示获胜的百分率，保留3位小数。<br />
</p></div><h2>Sample Input</h2>
			<div class=content><span class=sampledata> <br />
2 1 1<br />
50 50 0<br />
0 0 100<br />
1 2 1<br />
20 20 60<br />
 <br />
</span></div><h2>Sample Output</h2>
			<div class=content><span class=sampledata>100.000%<br />
69.231%<br />
 <br />
</span></div><h2>HINT</h2>
			<div class=content><p><p>Data Limit<br /><br />
对于40%的测试点，n&lt;=500 <br /><br />
对于100%的测试点，n&lt;=1000,m1,m2&lt;=100。<br /><br />
&nbsp;<br /><br />
每个测试点中，数据组数都不超过10<br /><br />
&nbsp;</p></p></div><h2>Source</h2>
			<div class=content><p><a href='problemset.html?search=2011福建集训'>2011福建集训</a></p></div><center>[<a href='submitpage.php?id=2446'>Submit</a>][<a href='problemstatus.php?id=2446'>Status</a>][<a href='bbs.php?id=2446'>Discuss</a>]</center>﻿<br>

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